Answer:
a) night, from cool land to sea
b) day, from cool sea to land
6r - 3t = 6 /*8
6r + 8t = - 16 /*3
48r - 24t = 48
48r + 24t = - 48
---------------------- +
96r = 0
r = 0
t = ( -16 + 6r)/8 = - 16/8 = - 2
(-4,-3) need 20 characters
Most of the time it will be Length x Width x Height.